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#11
When first going to set up ubuntu on one drive with EasyBCD back in 2008 one thing I learned about the ubuntu version of GParted that comes up is to select the manual option and make the root partition the mount point "/" using the edit partition option plus check off the "Grub isn't installed in bootsector" box to prevent the Windows mbr from being changed.
How Grub ended up on the mbr when installing ubuntu onto a flash drive is still kind of a mystery following previous steps proved successful. But the startup repair still did it's job in restoring the mbr entries for 7 when performed more recently with 7. It never hurts to schedule the checkdisk tool either in case any bad sectors or misplaced boot information needs correction.
Typically when Grub is installed the option to boot any Windows installation is seen there to select however. Even with Grub however there still should be an option to make 7 the default OS when following the wiki for that. Here however I solve the accidental Grub in mbr problems by seeing any distro go onto a vhd in the Oracle Virtual Box since each one often ends up being a temp install to start with.